Fix recording search

MusicBrainz::Recording.search("Track title", "artist name") now works and is tested in spec/models/recording_spec.rb

Moved from Track.search to Recording.search since the name change should remove a bunch of cruft in BaseModel.search (I want to say this is the factory design pattern).

Sorry it took me so long to fix what I broke. Thanks!
rspec:
42 examples, 0 failures